RNA thường bắt đầu bằng base nào

Xin lỗi vì bản dịch xấu.  Nó được tạo thành từ các căn cứ adenine, cytosine, guanine và uracil.

Explanation:

So với RNA, DNA có thymine thay vì uracil trong một phân tử di truyền polymer.

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.